They don't have a kit that adds 750lbs in each rear locker according to them. Their three bags are 710lbs total so each one isn't more than a few hundred pounds. I have managed to get about 500lbs in the back locker in our X25 and another 1800lbs plus the stock ballast. We have about 2500-2600lbs in it now.

I will put up some new pics this week. Our wave is way better than the pics I've posted now that it's dialed in 100% and we have all the ballast we need.